Case Report: A 46-year-old woman with multiple endocrine neoplasia type 2A was admitted to the endocrine ward of the National Institutes of Health Warren Grant Magnuson Clinical Center. On a previous admission, she had reported progressive spells of headaches, paleness, and palpitations and was found to have bilateral adrenal pheochromocytomas (right side, 4.7 × 3.1 cm; left side, 2.0 × 1.5 cm) with significantly elevated catecholamine and metanephrine levels (Table 1).The patient had extensive cervical and mediastinal adenopathy from metastatic medullary thyroid cancer and serum calcitonin levels greater than 30 000 pg/mL. Oral furosemide (20 mg/d) had been added to her long-term medications 35 days before the current admission in an attempt to improve chronic peripheral edema, but no significant changes in urine output, weight, vital signs, or edema were observed.